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What commands are available in recovery mode?
by Mark 30 Dec '10

30 Dec '10

I have a CentOS VM that I messed up and it now can't find /home (because it's gone), so it comes up in recovery mode. What can I do in recovery mode? It won't let me modify any files, which makes it hard to fix the fstab, so ...???

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2 Ethernet cabling question
by S Mathias 30 Dec '10

30 Dec '10

Two questions that was not always clear for me [sorry for posting to this list :\]: ############################################################################################## Q1) when cabling, is the color order important? like: straight cabling: A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown could be eg.: like this?? A side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orange B side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orange ############################################################################################## Q2) again cabling.. i know what is the color order of straight and crossover cabling. BUT: what are the color orders, when i need to create physically two separated networks? 568B; straight; nic to switch: A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown ---------- 568A; crossover; nic to nic: [it's not so important about from ~2005]: switch the pairs: 1&2 with 3&6 on one side: A side: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown ---------- one cable, two straight networks: A side: I.: II.: B side: I.: II.: ---------- one cable, two crossover networks: A side: I.: II.: B side: I.: II.: ---------- one cable, one straight and one crossover network: A side [straight]: I.: II.: B side [crossover]: I.: II.: ---------- one cable, one crossover and one straight network: A side [crossover]: I.: II.: B side [straight]: I.: II.: ############################################################################################## Thank you for any pointings, links, or specific answers. Happy Christmas!

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Re: [CentOS] Network communication between hosts
by derleader __ 29 Dec '10

29 Dec '10

Thank you for the reply. The data is not so much - CPU utilization, RAM utilization, List of installed software, list of users and so on. The information is not so much. What are the options for this task is there a C++ library that I can use to convert the data and then to transfer if via network? Regards Peter >> I need advice about developing C++ program. I need to develop 2 >> application which must communicate via network using SSL encryption. >> The problem is in which format to exchange the data. I can use XML >> format to exchange data between the hosts but a lot traffic will be >> generated. What are the usual practices to exchange data between the >> hosts? > >rather offtopic for this list. but... > >XML is about the most inefficient format imaginable, typically exploding >your data to many times its original size, especially if it has lots of >small fields > >what format is the data in now that you're exchanging? I'd want to use >something close to the native format of the data. if performance is >important, you'll want to transmit the data in binary as close to its >native format as possible. if its complex structured data such as is >often expressed in XML, you could look at defining a binary interchange >format with JSON or ASN.1, but I'd be more inclined to roll my own >simple binary message format since its just between your own two programs. > > > > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos >

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Network communication between hosts
by derleader __ 29 Dec '10

29 Dec '10

Hi, I need advice about developing C++ program. I need to develop 2 application which must communicate via network using SSL encryption. The problem is in which format to exchange the data. I can use XML format to exchange data between the hosts but a lot traffic will be generated. What are the usual practices to exchange data between the hosts? Regards Peter

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Problems with motherboard support? INTEL DP43BF
by robert mena 28 Dec '10

28 Dec '10

Hi, I've installed Centos 5.5 (plus updates) in a machine with INTEL DP43BF motherboard. In order to make Linux detect the PCIs I've added the pci=assign-busses in my GRUB conf. Everything runs fine but within less than 2 days of uptime the machine simply freezes (black console no connectivity). This has happened more than one time so I'm considering to be a problem. The memtest passed without a problem and the machine uses a compact flash (sandisk extreme III 4GB) as a disk. I could only find the error messages in my /var/log/messages but those appear hours before the actual lock. kernel: 0000:00:1a.7 EHCI: BIOS handoff failed (BIOS bug ?) 01010001 kernel: 0000:00:1d.7 EHCI: BIOS handoff failed (BIOS bug ?) 01010001 kernel: eth4: PCI Bus error a290. kernel: eth4: PCI Bus error 0290. kernel: eth3: PCI Bus error 2290. kernel: eth3: PCI Bus error 0290. Any tips?

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logrotate.d - reload vs restart
by Frank Cox 28 Dec '10

28 Dec '10

Looking at some of the stuff in /etc/logrotate.d, I see entries like this in some of the configuration files: postrotate /sbin/service privoxy reload 2> /dev/null || true >From the commandline, that doesn't work: # /sbin/service privoxy reload 2> /dev/null || true Usage: /etc/init.d/privoxy {start|stop|restart} Changing reload to restart does work: ]# /sbin/service privoxy restart 2> /dev/null || true Stopping Privoxy, OK. Starting Privoxy, OK. I find "reload" in the httpd logrotate file as well: postrotate /sbin/service httpd reload > /dev/null 2>/dev/null || true What am I failing to understand? -- MELVILLE THEATRE ~ Melville Sask ~ www.melvilletheatre.com www.creekfm.com - FIFTY THOUSAND WATTS of POW WOW POWER!

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Kickstart Network Configuration Issues
by Daniel Theisen 28 Dec '10

28 Dec '10

Hello all, I've been struggling with an issue with my kickstart configuration for a while now. My kickstart files are stored within the initrd image. What I would like to do here, is when the kickstart first starts up, I want it to grab a DHCP address (it does at the moment) so it can grab all of the necessary installation data off the net. Then, at some point _IN_ the install process, I'd like to have it query for manually input network settings. Here is my current kickstart script: auth --useshadow --enablemd5 bootloader --location=mbr zerombr clearpart --all --initlabel text firewall --enabled --port=22:tcp firstboot --disable keyboard us lang en_US logging --level=info url --url=http://mirror.nexcess.net/CentOS/5.5/os/x86_64/ reboot --eject rootpw --iscrypted xx selinux --enforcing skipx timezone --isUtc America/Detroit install part /boot --bytes-per-inode=4096 --fstype="ext3" --size=512 --ondisk=sda part swap --bytes-per-inode=4096 --fstype="swap" --size=2048 --ondisk=sda part / --bytes-per-inode=4096 --fstype="ext3" --grow --size=1 --ondisk=sda part /backup --bytes-per-inode=4096 --fstype="ext3" --grow --size=1 --ondisk=sdb network --bootproto=dhcp --device=eth0 %packages --nobase @core system-config-network-tui %post echo "nameserver 4.2.2.1" > /etc/resolv.conf echo "nameserver 8.8.8.8" >> /etc/resolv.conf # write netconfig script cat << EOF > /bin/netconfig #!/bin/bash # check if user is root if [[ \$EUID -ne 0 ]]; then echo "This script must be run as root" 1>&2 exit 1 fi # run system-config-network-tui /usr/sbin/system-config-network-tui # set variables eth0f="/etc/sysconfig/network-scripts/ifcfg-eth0" eth1f="/etc/sysconfig/network-scripts/ifcfg-eth1" netcfg="/etc/sysconfig/network" # turn on eth1 if it has an address, remove gateway.. shouldn't be set here # anyways if [ -f "\$eth1f" ]; then if grep -q "IPADDR" \$eth1f; then sed -i 's/ONBOOT=no/ONBOOT=yes/' \$eth1f sed -i '/^GATEWAY/d' \$eth1f sed -i '/^HOTPLUG/d' \$eth1f fi fi # move gateway from ifcfg-eth0 to /etc/sysconfig/network if [ -f "\$eth0f" ]; then e0gw=\$(grep "GATEWAY" \$eth0f) sed -i '/^GATEWAY/d' \$eth0f # check to see if the gateway is already set. if it is, delete it first if ! grep -q "GATEWAY" /etc/sysconfig/network; then echo \$e0gw >> \$netcfg else sed -i '/^GATEWAY/d' \$netcfg echo \$e0gw >> \$netcfg fi fi EOF chmod +x /bin/netconfig At the moment, I have a not-so-elegant script written to the server to be run manually after install. I began using system-config-network-tui vanilla, but realized it had some differences from the network configuration tool in anaconda (net.c?) I tried my best to correct those differences with my netconfig script. I've already tried running system-config-network-tui in the %post section, but it doesn't seem to work. If anyone has had experience in dealing with a scenario such as this, any help would be greatly appreciated. Thanks, Daniel Theisen <dtheisen(a)nexcess.net>

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Hello
by portablemanagement＠yahoo.com 28 Dec '10

28 Dec '10

Hello I need a clean link for a Cent us download please I don't want to risk any virus'. Thank you kindly for such a wonderful program!

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Re: [CentOS] Hello
by Mike Burger 28 Dec '10

28 Dec '10

Did you try the mirror list located on the CentOS site? > Hello I need a clean link for a Cent us download please I don't want to > risk any virus'. > Thank you kindly for such a wonderful program! > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Mike Burger http://www.bubbanfriends.org Visit the Dog Pound II BBS telnet://dogpound2.citadel.org or http://dogpound2.citadel.org To be notified of updates to the web site, visit: https://www.bubbanfriends.org/mailman/listinfo/site-update or send a blank email message to: site-update-subscribe(a)bubbanfriends.org

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Server unresponsive until reboot, memory exhausted
by james 28 Dec '10

28 Dec '10

I'm having an issue with an apache web server running the latest CentOS5 kernel (this issue is not new to the kernel). After a few days/weeks of running the server will become unresponsive and will require a physical reboot in order to come back online. The system is so unresponsive when the issue occurs that login at console is not even possible. I have atop installed and have looked back before the crash to see what happened process wise and I can see the http starts using a lot of memory and CPU usage. The vmcommit jumps from 1.8 GB to 4.8GB in a matter of a few minutes. The VSIZE of the httpd process jumps from 8.1GB to 36.9GB. So apache is doing something -- but how can I get historical data for this? I also see that paging is very active, probably why the server is unresponsive. I have looked through the apache logs and system logs and there is nothing obvious that is consuming all that memory. I know of the server-status module for apache but that is only useful if you can get to the server during the crash (I can't) and doesn't have any historical data. The issue occurs seemingly randomly, last time in the middle of the night with little or no user traffic. James

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